Locking device



Sept. 28, 1943. D. H. HOFFMAN LOCKING DEVICE Filed Oct. 28, 1941 VENTOR. OFF/WAN b ATTORNEYS This invention relates be applied to: nuts and against 1 hegboltm 'lihe cam mayybe pivoted 61-; V

nut, or it may be carried byzar s nreic abl p o i d:cl s

' s exerted b c m.

, is removed from the nut.

nmi i eiion to late metre meters: 1

more particularly to locking'devices which-may loosening thereof.

An pbiectzof the present invention: isthe-mprovision 0L3 lock nut which lis' simple, in constmw tiony: inexpensive to manufacture and greatly effective inioperation.

Another-object is the vicewhich: may he otgstandard fprm and size for the purpose of locking. theabolts carrying such nuts;

Amfutther obiect is theprovision of- -lock ing meanswhich .may be easily and effectively 16m:

provision of a locking plotted-for: preventing .theyturning \Ofi nutsizpr bolts in either direction or. in both directions; 7

-,.;Qthcr obiects \oirthe present inventionzwill be:

come apparent in the course of the following sp ification.

Ln; accemplishing, the objects of .it'hepresent invention it was; found desirable to'provideea' cam a in a- :knur1edor fluted surface extending at a a radua ly increasing. radial distance: ironic-the;

ful r m iofithe cam and pressed by; aaspring rectly upon the suppont which is mo nted-upon the nut. Astop the cam wh ch: has n rde eto ensure c ease e radi 7 She n e. .tion

the like to preventut-he;

conveniently ,ap'plied to nuts to that e;.portion-'of'f the smallest-radial. distance; that: pressure upon the bolt; o portions; havin gradually in wil emanate c a r m elfoilpw n detailed Q I1 iQ when taken in eonn cti n w th t acc mpany zdrawine as: 9 he inr n ie id ing:

the V v Figure 1, is a, top viewof. a A e'. evi e con truc ed i ccc danc wi the principles of the. present i ventienj, Fiee efifi.L tseciipn a on e ne o Figure 1', looking in the direction of the arrows.

nit provided xampl only; preferred semi-t Figure 3 is a bottom view of the nut shown in I t Figure l. a

Figure 4 is a side view of the nut and the locking device.

Figure 5 illustrates the locking-device when it Figure 6 is a section through a of a somewhat difierent type f v Figure 7 is a top View of the device shown in in Figure 6. I I a The drawing shows a nut 8 of the usual hexagonal form which is screwed upon 'a bolt 9.

locking device I to, .zinctudes a u p rt.

' a hezh lt edge .11 9;;andethe pressure. u on the boflt. v

s1iracedllinthe directiurn-from' the :edge al 8:; toward the edge ii 9; Obviousiy, zthe peripheral fiointof the hole radial distanceof The" locking i 1 7, vice h fla m tai i etmpei pr.

t Us bolt a;- Th sur ac 11 it ms v o posedc aci i at ts. n age:

Glenna first engages the "bolt :8 -1srlocated clo s.

exe'r'tedial'ongthe le mustvbeso shapedthait the edge i9 attire suj raee 1-1 is at approximatelyltheis'arne distance from itne icenter or "t e" hole 16 s the closest "14; and that the the surface ll gradually ihv creases in the direction from the edge l9 to the edge i8 to provide a firm andpositive engagement between a bolt 9 extending through the hole 14 anda part of the surface ll. In the device shown in Figures 1 I5 is swingably mounted upon projections 2i and 22 which are pressed out which fit into the hole l 6 of the cam l5. The

projection 2| is formed upon the portion l2 oi the support in and is directedinwardly and toward the projection 22 which is situated oppotoe, the camp I of the support [0 and upon the opposite" surface 3 I site the projection 2| the support I I].

A tongue 23 is pressed or cut out of the portion I2 of the support It], thus leaving an opening 24 in the support. The tongue 23 is bent inwardly and then brought into engagement with the side surface 25 of the cam I5, So that the tongue 23 can serve as a spring which exerts pressure upon the cam I5 in the direction of the arrow 2m g It is apparent from I5 should press against the bolt 9 along the cam surface I I in the direction from the edge I8 toward the edge I9, and not in the opposite and upon the portion II of direction. To prevent an incorrect location' f the ewe ltiiatitheany carried by the pivot 4|, while the other end of the spring 42 is embedded in the cam 40. The spring 42 tends to press the cam 40 against the bolt 9 in the direction of the arrow 43. The movement of the cam 40 is limited by a stop 44 which is carried by the nut 8.

This construction is repeated upon the opposite 'side of the nut 8 which carries a cam 45 mounted upon a pivot 46 embedded in the nut :{I'hecam 45-is pressed against-:rt-he bolt 9 'by\a"spring1;47. V a

The pressure of two cams 49 and the bolt 9 prevents any turning of the bolt. In orderto release'the bolt 9, both cams must be the cam I5, a stop 26 is pressed, out of the P 7:

tion I2 of the support 21. The stop cated close to the'edge I9.

In order rto lock the bolt 9 it is merely necessary to' place the support II over-the nut '8' with the edge portion I3 of the support I I in engagement with a side surface of the nut 8,the bolt 9 extendingthrough the opening I4 -of the supportI I ;-the-cam I5 is turned either manually or by any suitable tool in'the direction opposed to that of the arrow 20, thereby bending the tongue or spring 23;while the support 'I IL, is being mounted to clear the opening I4 for the bolt 9. As soon as the cam I5 is released, the tongue or spring"23 willcause the-cam surface I! to engage thebolt 9. Thereafter,it will not be possible to turnthe-boltin the directionof the arrow 29, since any such movement will-tend to move the cam I5 in the direction of the arrow 20,-rthereby steadily increasing-thepressure of= the'surf ace II "against the bolt 9 due to the in creasing radial distance of 'the surface IT, a

a In the illustrated arrangement in" which the support I U is placed upon-the surface 30 of the nut 8, the bolt 9 may turn freely-in-the direction opposed to that of the arrow 29.-'If

- the support In is placed upon the opposite surface -3I of the nut 8; the cam I5'w1'll permit the rotation of the bolt -9-in thedirection-of the arrow 29, while any rotati n of the bolt 9 in the opposite direction will be prevented In of the nut 8 in the manner illustrated, while anothersimilar locking device should be placed of the nut 8. A locking device preventing the rotation of the bolt 9 in both directionsiis.illustratedlinFig-o ures 6 and 7.. This .devicecomprisesa .cam 49 which is similanin sha e to, thecamnji and, which is swingab-ly mounted upon a pivot 4I.

The pivot is firmly mounted upon one side t Pu As h e end w ic f I9, thereby leaving a hole 26 extends inwardly and is lo- I the cam surface 28, which is; opposite the surface and which terminates in moved away from it simultaneously.

I t is;appa rent that the specific examples shown above have been given by way of illustration and notby way of limitation and that the structures'above described are subject to widevariatioffbfidmodification without departing from v the scope; on intent of the invention; All of such variations-and modifications are .to be included withinz'thei-scope of the: present invention; ;.a

What is claimed is:

'1'...A device for looking a. bolt carrying a nut,

said device comprising a support having asubstantiallyvfiat therein for said bolt, a U-shaped. end portion having two opposed projectionsformed therein andconstituting a pivot; and another end por-' tion bent-away from said. U-shaped end portion and adapted t'o engage nut; and'a cam swingably mountedupon said pivot, said cam .Lcomprising" a tending 'tola comparatively greater distance from the center z-of said pivot, another side surface extending to a comparatively smaller :distance from :said center, and a substantially uniformly outwardly curved fluted, bolt-engaging surface the first-Zmentioned side surface of the. cam to and another bent portion cam.

2. Adevice for prising a support having an opening-formed therein for 'said'bolt, and comprising a U-shaped l end' portionga pivot carried by said U-shaped end portion, anda cam'swingablymounted upon molt-engaging surface extending between said 'side surfaces, and resilient means engaging the first mentioned side surfacebfthe cam to presssaid bolt-engag against' portion having an opening formed:

locking a bolt, said device com- 

